Like many families, Rebecca and her husband faced years worth of fertility issues before Harper arrived. She calls the battle the "struggle of her life" and had hoped to have more children after her daughter was born. "It weighed on me every time IVF would fail," said Rebecca, who had wanted Harper to be able to experience the joy of siblings.

Then one day, Harper paraded out of her playroom in princess regalia, with a coordinating Lola by her side — tutu and all. "That’s when I realized, I’m not going to feel bad about not giving her a sibling," Rebecca told Today Moms. Keep reading to see the heartwarming (and hilarious) bond between Harper and Lola, plus their Mom's quick-witted commentary.